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I have a 90g tank. About two months old now. I have a hang on the back prism skimmer. I was wondering how long does it take to actually see build up of scum in the cup? I am not sure if it is working properly.
the skimmer make bubbles thats how it fills the cup up. if you skimmer is not producin bubbles then you have a problem you need to make an adjustment if you can on that skimmer.
Made an adjustment to a knob that I didn't even know I could and started getting bubbles at the bottom of the cup. I guess over time more bubbles will come and will over flow into the cup?